I believe it was the sheet music that was paywalled, not the software. That was a bit concerning since as far as I know a large portion of it was UGC and some of it even public domain, so it was weird to ask for a subscription payment for it. At this point though, it does look like they have made some amends, though I'm not sure if everyone's satisfied. Doesn't seem to matter too much in the grand scheme of things, overall, though it was an unfortunate situation to watch unfold even as an outsider.